linux-kernel - Re: [PATCH] perf: fix broken perf inject -b

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Date:	Fri, 13 Jan 2012 14:53:15 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	robert.richter@....com
Subject: Re: [PATCH] perf: fix broken perf inject -b

Em Fri, Jan 13, 2012 at 03:47:31PM +0100, Stephane Eranian escreveu:
> 
> perf inject -b was broken. It would not inject any build_ids
> into the stream. Furthermore, it would strip samples from the
> stream.

Against which tree is this patch?
 
> The reason was a missing initialization of the event attribute
> structures. The perf_tool.tool.attr() callback was pointing to
> a simple repipe. But there was no initialization of internal data
> structures to keep track of events and event ids. That later caused
> event id lookups to fail, and samples would get dropped.
> 
> The patch simply adds back the call to perf_event__process_attr()
> to initialize the evlist structure. Build_ids are again injected.
> The PID is also inject for PERF_RECORD_HEADER_BUILD_ID.
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
> 
> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
> index 09c1061..f38f370 100644
> --- a/tools/perf/builtin-inject.c
> +++ b/tools/perf/builtin-inject.c
> @@ -60,6 +60,11 @@ static int perf_event__repipe_tracing_data_synth(union perf_event *event,
>  static int perf_event__repipe_attr(union perf_event *event,
>  				   struct perf_evlist **pevlist __used)
>  {
> +	int ret;
> +	ret = perf_event__process_attr(event, pevlist);
> +	if (ret)
> +		return ret;
> +
>  	return perf_event__repipe_synth(NULL, event, NULL);
>  }
>  
> @@ -173,6 +178,7 @@ static int perf_event__inject_buildid(struct perf_tool *tool,
>  		       event->header.type);
>  		goto repipe;
>  	}
> +	machine->pid = event->ip.pid;
>  
>  	thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
>  			      event->ip.ip, &al);
--
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